[PATCH] D149903: [VPlan] Replace IR based truncateToMinimalBitwidths with VPlan version.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: Ayal, gilr, rengolin.
Herald added subscribers: StephenFan, tschuett, psnobl, rogfer01, bollu, hiraditya.
Herald added a project: All.
fhahn requested review of this revision.
Herald added subscribers: pcwang-thead, vkmr.
Herald added a project: LLVM.

This patch replaces the IR based truncateToMinimalBitwidths with a VPlan
version. This has 2 benefits:

1. the VPlan-based version is simpler; we don't need to implement special codegen for each supported instruction type like the IR based one.
2. Removes a dependency on the cost-model after VPlan execution and
3. Removes a use of getVPValue that uses underlying values after VPlan execution (See removed FIXME).

Depends on D149081 <https://reviews.llvm.org/D149081>.

Depends on D149079 <https://reviews.llvm.org/D149079>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149903

Files:
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
  llvm/lib/Transforms/Vectorize/VPlanTransforms.h
  llvm/test/Transforms/LoopVectorize/AArch64/deterministic-type-shrinkage.ll
  llvm/test/Transforms/LoopVectorize/ARM/pointer_iv.ll

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